Drawing apparatus for textile fiber preparation



W. NAEGELI April 20, 1954 DRAWING APPARATUS FOR TEXTILE FIBER PREPARATION Filed March 23. 1948 Fig. 2

IN V EN TOR.

Patented Apr. 20, 1954 UNITED STATES PATENT OFFICE DRAWING APPARATUS FOR TEXTILE FIBER PREPARATION Application March 23, 1948, Serial N 0. 16,416

Claims priority, application Switzerland March 31, 19.47

'5 Claims.

This invention relates to a drawing apparatus for spinningframes, comprising two co-ac'ting endless runner bands, of which the upper band runs over a top roll and a guide bar, and the lower band over a bottom roll and a guide bar.

In known drawing apparatus of the type mentioned, the said two guide bars together form transverse guide .forks which are inserted in mounts. The later are held in their position by drawing rolls. The runner bands, due to friction between same andthe said forks, have a tendency to take the latter along in the direction of movement of the sliver. 'It thus may happen, particularly in case of thicker drawing frame slivers and. runner bands and especially when the latter have been stretched in operation, that the forks become detached from the mounts, in spite of holding down means such as notches, detents, snugs, recesses and the like, and drop on the floor or are seized when dropping between moving frameparts, whichleads to inconveniences and even to serious breakdowns, and also the forks easily may become lost. A further disadvantage of deflecting means of the kind referred to arises from the requirement of working slivers from fibers of different lengths in one and the same drawing frame and of producing different yarn counts. To such end, forks of differing spacing are required for each working station on such drawing frames in order to insert, in accord with the conditions at hand, forks with the relatively most favourable spacing into the mounts. Aside from higher production costs, the exchange of the said forks entails a complicated and time consuming additional work which has to be repeated time and again. Since, moreover, the spacing of the exchangeable forks is only stepwise variable, ideal working conditions cannot even approximately'be attained.

In order to eliminate the said disadvantages, the two guide bars in accord with the present invention are mounted independently of each other, and at least the lower guide bar is adjustably positioned.

In such preferred form of invention, the position of the lower guide bars of a plurality of heads is made variable from a single common control point. To such end, supporting plates may be provided at both ends of the guide bars, which are mounted rockable on a bottom roll shaft and supported, at a second point, on an adjustable base. The latter preferably is constituted by a longitudinally displaceable rail which extends over a plurality of heads of the drawing frame and comprises wedgelike lugs which serve for pivoting the said plates.

- which:

Fig. '1 is a longitudinal cross-sectional View ofa first embodiment wherein the lower guide bars are indirectly Supported .on a rail.

Fig. 2 is a transverse sectional view .on a smaller scale, with said rail in elevation,

Fig. 3 is a partial view corresponding to Fig. .1,- of a second example,

Fig. 4 is a similar view, of a third example, and

Fig. 5 is a top view on a smaller scale, of .the drawing frame of which .Fig. 1 .is a cross-sectional view.

The drawing apparatus shown in Figs. 1 and2 comprises .a stationary frame 10 comprising stands Illa in which a lower feed roll shaft Ml and a lower delivery roll .shaft '41 are rotatably supported parallel to each other. These shafts preferably extend through the whole length of the frame it and are driven .in known manner. At each drawing station, the shaft 40 carries an integral lower feed roll '42 and the shaft 4] carries an integral lower delivery roll 43. Intermediate thes'hafts 4B and ill a pressureroll shaft 44 is rotatably mounted .in the frame stands lila, said shaft 44 having at each drawing station, an integral lower pressure roll 4 in alignment with the feed roll 42 and the delivery roll .43. These three rolls 4, '42 and 33 of each station may be referred to as the lower roll set, only one .such set being shown in the drawing although the apparatus :may comprise a large number thereof. Ateach station, anendless runner band or apron 2 runs over the pressure roll '4 and a lower guide bar '6 .secured at its ends .in a lateral supportingplate I, which at its rear end is swingably mounted on the bottom roll shaft 44 by means of a semi-circular recess. The supporting plates 1 are supported in front on .a rail 8 which is common .to the plates 1 of a plurality of heads .and advantageously extends over the entire length of the drawing -frame.

In accord with Fig. '2, the rail 8 is supported on the roll stands l'fla through the 'tapering'lugs 9 provided on their bottom side. By displacing the rail 8, the front elevation of the plates I and guide bars 6 of the lower bands 2, may be varied as desired within the given limits. Supportarms are mounted each on a fixed pin 3! so as to be upwardly swingable about said pin. Preferably, there is one such arm for each two drawing stations and it lies substantially in a plane half-way between these stations. An auxiliary saddle 29 carrying a delivery roll axle 46 is hinged to each arm 30 in a known way by a pin 41. Further, a pressure saddle 26 is hinged to the auxiliary saddle 29 by means of a pin 48. In the saddle 26, two axles, namely, an upper feed roll axle and an upper pressure roll axle 21 are mounted. The axles 45, 46 and 21 project to both sides of the pressure saddles 26 and 29. On each of their projecting ends, the axles 45, 46 and 21 carry an upper feed roll 28, an upper delivery roll 49 and an upper pressure roll 3, re- 6 spectively. An upper guide bar 5 is fixed in the pressure saddle 26 and also projects to both sides thereof. Another endless runner band or apron I runs over each of the pressure rolls 3 and the corresponding end portion of the guide bar 5. The plates I at their rear end possess an upper horn II for laterally guiding the upper runner bands I. A corresponding lower horn serves for laterally guiding the respective lower band 2. The free ends of the said horns laterally are bent off to the outside, whereby the runner bands be laterally guided with only little wear.

In the alternative embodiment, shown in Fig. 3, the lateral supporting plates 7 and, thus, the lower guide bars 6 are set and adjusted by a shaft I2 which is mounted rotatable in the roll stands Ma by means of eccentric rings I3. In Fig. 3, the upper portion of the drawing apparatus is not shown. The spacing between the guide bars is varied by a corresponding rotation of the said shaft I2. The parts not shown in Fig. 3 are similar to those shown in Fig. 1.

In the further embodiment, shown in Fig. 4, the top-rolls 3 of the drawing apparatus are displaceably mounted in holders I 4 which are swingably mounted on pin 3I and supported through snubs I5 on the roll stands I 0. The laterally projecting guide bar and an axle I9 are inserted in a link I8 and the said axle I9 receives at each end a top roll 3. For the sake of clarity the top roll 3, which is disposed closer to the observer, and the appurtenant top band I are not shown. The guide bar 50 and roll axle is for an upper pair of runner bands form a rigid carrier by means of the said link I8, and such carrier structure is displaceably guided in lateral grooves 20 and 2| of two adjacent holders M.

The said grooves 2I are disposed obliquely relative to the said holders, and are provided in guide members 22 which are mounted displaceable on a bar 23 disposed on the front face of the holders I4. The guide members 22 are displaceable in such a way as to permit swinging of the upper band aggregate as a unit about the roll axis I9 for the purpose of changing the elevation of the upper guide bars 50 of the runner bands I with respect to that of the said roll axis, which itself is defined by the position taken by the roll I9 as it presses the bands I and 2, with the sliver between them, against each other on the lower pressure roll 4. As will be appreciated from Fig. 4, the spacing of the guide bars 59 and 60, for example, is increased when displacing the guide members 22 as indicated by the arrow shown, that is, towards the front top roll. The lower part of the drawing apparatus is similar 4 to that shown in Figs. 1 and 2 and will not be described here again.

The top rolls 3 are Weighted from a pressure saddle 24 through the link I8, directly on to the roll axle I9. The weight is transmitted through a snub 25 of the link I8, which snub is offset relative to the roll axle I9, so that guide bar 50 is pressed against the lower supporting face of the groove 2 I.

When the grooves 20, 2| have been so adjusted in holder I4 that their relative position is fixed and the entire'upper band aggregate always occupies the same position relative to holder I4, the spacing of the guide bars is jointly adjustable by means of the adjusting rail 8. Owing to the complete separation of the front guiding means and, therefore, of the two coacting endless runner bands, according to the present invention as illustrated in Fig. 1, the drawing field in the range of the bands is cleared by simply swinging upwards the upper band aggregate. It thus is made possible, in a simple way and manner, to remove an eventual obstacle in the orderly passage of the fibers.

Further, the time consuming exchange of traverse guide forks for the purpose of varying the grip of the runner bands on the sliver, as required heretofore, is eliminated. Such grip may be set, in drawing apparatus adapted in accord with the present invention, in all the drawing heads of one and the same frame side from a single control station. The adjustability of the guide bar spacing according to the present invention advantageously also is possible when the drawing frame is in operation so as to permit to set same with corresponding ease on to favourable operating conditions.

What I claim as new, and desire to secure by Letters Patent is:

1. In drawing mechanism for textile fibre preparation, a frame, a lower delivery roll shaft and a lower pressure roll shaft rotatably supported parallel to each other in said frame, a plurality of lower roll sets each comprising a lower delivery roll and a lower pressure roll formed on said lower delivery and pressure roll shafts, respectively, a corresponding plurality of lower carrier structures swingably mounted on said lower pressure roll shaft, said structures each comprising a. pair of lateral guide plates connected between them by a lower guide bar parallel to said lower pressure roll shaft, a corresponding plurality of lower endless aprons each running over one of said lower pressure rolls and one of the said lower guide bars; a plurality of upper roll sets each comprising an upper delivery roll and an upper pressure roll; a plurality of upper supporting structures mounted on said frame, each such structure carrying the rolls of at least one of the said upper roll sets, the number of such upper roll sets being equal to that of the said lower roll sets, a plurality of upper guide bars each fixed in on of said upper supporting structures parallel to said upper pressure roll or rolls mounted on such structure, a plurality of upper endless. aprons each running over one of said upper pressure rolls and its corresponding upper guide bar, means biassing said upper rolls towards said lower rolls, movable position changing means supported in said frame and common to and supporting the said lower carrier structures each at a point spaced from said lower pressure roll shaft for jointly swinging the said lower carrier structures about said lower P 35%? F011 shaft.

2. Drawing mechanism as claimed in claim 1, said movable position changing means comprising a rail member supporting said lower carrier structures each at a point spaced from said lower pressure roll shaft and having wedge-shaped portions at which it is lengthwise shiftably supported in said frame whereby said lower carrier structures are jointly swung about said lower pressure roll shaft on lengthwise displacement of said rail.

3. Drawing mechanism as claimed in claim 1, said movable position changing means comprising an adjusting shaft rotatably supported in said frame and having eccentric surfaces each supporting one of said lower carrier structures at a point spaced from said lower pressure roll shaft whereby said lower carrier structures are jointly swung about said lower pressure roll shaft on rotation of said adjusting shaft.

4. Drawing mechanism as claimed in claim 1 in which each of said upper supporting struc tures is hinged on said frame and carries two upper roll sets with the corresponding rolls of said sets rotatably mounted substantially in alignment with each other on opposite sides of said structure, said upper guide bar fixed to said upper supporting structure extending to opposite sides thereof, said two upper pressure rolls and said upper guide bar carrying two upper endless aprons on opposite sides of said upper supporting structures.

5. Drawing mechanism as claimed in claim 1, in which said guide plates each have a horn extending upwards adjacent to one side of the corresponding upper pressure roll to form a lateral guide for the upper endless belt running over said upper pressure roll.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,025,394 Langen Dec. 24, 1935 2,027,212 Truslow Jan. '7, 1936 2,100,139 Honda Nov. 23, 1937 2,306,848 Toenniessen Dec. 29, 1942 2,332,973 Louie Oct. 26, 1943 FOREIGN PATENTS Number Country Date 254,619 Italy Aug. 13, 1927 480,218 Great Britain Feb. 18, 1938 

